Tow tractor



FIG. 1 is a perspective view over the right rear quarter of the tow tractor, showing my new design;

FIG. 2 is a front perspective view thereof over the right front quarter;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof. 

The ornamental design for a tow tractor, as shown. 